LG FLATRON Service Manual - Page 23

Troubleshooting Guide

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TROUBLESHOOTING GUIDE 1. NO POWER (LED INDICATOR OFF) : [A] Process Check 15V or ST_5V of Power B/D. Pass Check Output of IC1100, IC1101. Pass Fail Check 15V or ST_5V of Power B/D. Fail Check short of Fail Re-soldering of Change IC100, Q307. defect part of IC100, Q307. Pass Change IC1100, IC1101. Check Output of IC1102, IC1103. Pass Fail Check short of Fail Re-soldering of Change IC100, TU600, IC500. defect part of IC100, TU600, IC500. Pass Change IC1102, IC1103. Check Output of IC1104, IC1105. Pass Fail Check short of IC100, IC400. Pass Fail Re-soldering of Change defect part of IC100, IC400. Change IC1104, IC1105. Check LED Assy. Fail Change LED Assy. Pass Check P304 Connector. 5V 15V - 23 -

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- 23 -
TROUBLESHOOTING GUIDE
1. NO POWER (LED INDICATOR OFF) : [A] Process
Check 15V or
ST_5V of Power B/D.
Fail
Check 15V or
ST_5V of Power B/D.
Check Output of
IC1100, IC1101.
Check short of
IC100, Q307.
Pass
Pass
Pass
Pass
Re-soldering of Change
defect part of IC100, Q307.
Change IC1100, IC1101.
Change IC1102, IC1103.
Check Output of
IC1102, IC1103.
Check short of
IC100, TU600, IC500.
Re-soldering of Change
defect part of IC100, TU600,
IC500.
Change IC1104, IC1105.
Change LED Assy.
Check Output of
IC1104, IC1105.
Check LED Assy.
Check P304 Connector.
Check short of
IC100, IC400.
Re-soldering of Change
defect part of IC100, IC400.
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
5V
15V